The best answer to this question would probably come from a priest or shaman from an ancient civilisation where sound was used as a gateway to altered states of mind. But would we be able to understand their explanation if it does not come in the form of a...

Sound Healing has been with us since times immemorial. People have been using sound to change (or maintain) states of consciousness since the dawn of time. Currently, we are witnessing a rapidly growing interest in this field that was but a fringe movement...